Qifeng Lu, Chunqiang Wu, Chengli Qi, Yang Guo, Shengli Wu, Dawei An, Mi Liao National Satellite Meteorological Center ,CMA
Juan Li, Yan Liu, Jincheng Wang NWPC, CMA
Heather Lawrence, Nigel Atkinson and Katie Lean Niels Bornman, William Bell, Stephen English,
ECMWF, Met Office
FY-3C evaluation overview: CMA, ECMWF and UKMO [email protected]
Outline General introduction
Jointly evaluating FY-3C by CMA, ECMWF and UKMO
Monitoring FY-3 sounders – Early warning system
Summary
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Microwave Temperature Sounder (MWTS) 4 channel (~MSU) 13 channels
Microwave Humidity Sounder (MWHS) 5 channel (~MHS) 15channels with channels at 118 GHz
Infrared Atmospheric Sounder (IRAS) 20 channels (~HIRS/3)
Microwave Radiation Imager 10 channels (~AMSR-E)
The FY-3A/B/C Instrument Suite
GNSS Radio-Occultation Sounder (GNOS) (~GPS)
Jointly evaluating FY-3C by CMA, ECMWF and UKMO
Improved FengYun Satellite Data Assimilation
CMA/NSMC (Agency) Basic and general support (Cal/Val)
Manufacturer Feedback
NWP(User) Feedback
Closer collaborations among NWP user, agency and manufacturer --improve the misunderstanding and fill the gap from requirements
Share; early evaluation; preparation before launch
CMA ECMWF UKMO
The telecommunication conference is held every 3 month since Dec 2014 to communicate the progress on evaluating, improving and assimilating FY-3C data in NWP models
Key points progressing the FY-3C evaluation
CMA, ECMWF and UKMO starts to work together;
Scientists exchange: Katie's and Heather’s visiting CMA/NSMC learnt useful understanding on the FY-3C instruments to prepare them in UKMO UM system and ECMWF IFS system; Nigel’s visiting CMA/NSMC helps to exchange the understanding on the calibration; Stephen English’s visiting agrees further cooperation
FY-3 data quality monitoring, bias diagnose and correction system will be ready soon to support the operational assimilation through early abnormal warning;
EUMETSAT started the trial dissemination of FY-3C: MWTS-2, MWHS-2, MWRI, IRAS, commencing on 18 September 2014
MWHS2 NEdT FY-3C Specification FY-3C On-orbit FY-3B On-orbit FY-3A On-orbit
Channels
The NEdT from FY3A to FY3C is improved much
Specification FY-3C On-orbit FY-3C Pre-launch FY-3C On-orbit FY-3B On-orbit FY-3B
MWHS2
Comparisons of MWHS2 OMB statistics from ECMWF and UKMO
Neutral impact on medium-range forecast scores:
improvement
degradation
Forecast day Forecast day
183 GHz over ocean 183 GHz over ocean, land, sea-ice
Geopotential height SHEM, 500hPa Vector Wind SHEM, 500hPa
Assimilation Trials: 183 GHz channels from ECMWF
FY-3C teleconference, 8 December 2014
MWTS2: Optimize the passband to improve the OMB fit
MWTS2
MWTS-2 Land/sea bias
• Ch 5, 6, 7 and 8 display unphysical temp depressions over land
• These channels are not supposed to be surface sensitive
• Direct broadcast and global data affected
• anti-correlation with ch 1
• We formulated en empirical fix
Chan 1 BT Chan 6 BT
CHN06
Impact experiment from GRAPES Positive impact when MWTS-2 data are added in Global GRAPES (20140701-20140720)
Northern Hemisphere
Southern Hemisphere Tropic East Asia
The RMS is decreased
CTRL: Conventional (black lines) TEST: CONV+FY-3C MWTS-2 (red lines)
Geopotential Height
Neutral impact on the experiment when assimilating all observations (201407)
CTRL: Conventional data+NOAA-15/18/19, MetOp-A AMSU-A, GPS-RO TEST: CONV+FY-3C MWTS-2
Northern Hemisphere
Southern Hemisphere Tropic East Asis
Geopotential Height
CTRL: Conventional data+NOAA-15/18/19, MetOp-A AMSU-A, GPS-RO (black line) TEST: CONV+FY-3C MWTS-2 (red line)
The comparable data quality of FY-3C sounding instruments to its counterparts
183 GH
z 118 G
Hz
stdev(o - b)/K
MW
HS-
2 C
hann
el
MWHS-2 & ATMS
MWRI
IRAS
MWTS-2
Channel
Error Sta. of Refractivity
ROs 0 – 40 km 5 – 30 km Mean bias Mean STD Mean bias Mean STD
GNOS/GPS -0.01 1.66 -0.04 1.11 GNOS/BDS -0.09 1.37 -0.07 0.81 Metop/GRAS -0.21 0.91 -0.16 0.76 COSMIC -0.23 0.90 -0.16 0.71
Bias are consistent with each other
STD shows small below 30 km
Beidou shows least std below 5 km
Impact Experiment of FY3C/GNOS RO Data from GRAPES CTRL CTRL+GPS CTRL+GPS+BD
NH SH
GNOS data have neutral (NH) and positive impacts (SH) on GRAPES analysis and forecast skill.
Monitoring FY-3 sounders
--Early warning system at CMA/NSMC for operational assimilation
Parameters indicating the data quality Observing system: such as, frequency locker, Receiver;
Temperature: such as, PRT, instrument temperature;
Antenna: such as, cold space starting/end angle, warm load starting/end angel, earth scene starting/end angle;
Auxiliary information: time, volt, gain
FY-3 data quality monitoring, bias diagnosis and correction system will be released soon to support the operational assimilation through early anomaly warning
FY-3C MWTS2-CH6
Instrument Temperature
150&183GHz
Based on FY-3 Satellite data monitoring system: We found the MWHS instrument temperature and PRT temperature dropped from 2-19 March. MWHS(II) temperature was passively controlled, so the warm target can make heat exchange with satellite platform. During that time, MWTS was switched alternatively.
Fy3c Temporarily Out of Service
89&118GHz
Some instrument reboot ( VIRR、MWRI、MWHS、GNOS、IRAS、TOU)
In the middle of September, CMA decided opening another four instruments on FY-3C, so there are ten instruments except MERSI, back to work again, as a result, the instrument working temperature changes
The plan and status of FY-3C in NWP
ECMWF
2013 2014 2015
FY-3B MWHS Monitoring Op DA Op DA
FY-3C
MWTS2 Evaluating
Evaluating
(Now dead)
FY-3C
MWHS2 Evaluating Monitoring
FY-3C MWRI Evaluating Evaluating
FY-3C IRAS Evaluating Monitoring
FY-3C GNOS Sample data Sample data
UKMO
2013 2014 2015
FY-3B MWHS Evaluating Evaluating Monitoring
FY-3C
MWTS2 Evaluating
Evaluating
(Now dead)
FY-3C
MWHS2 Evaluating Monitoring
FY-3C MWRI Evaluating
FY-3C IRAS
FY-3C GNOS Evaluating Evaluating CMA NWPC 2013 2014 2015
FY-3B MWHS Evaluating Evaluating Evaluating
FY-3C
MWTS2 Evaluating
Evaluating
(Now dead)
FY-3C
MWHS2 Evaluating Evaluating
FY-3C MWRI Evaluating
FY-3C IRAS
FY-3C GNOS Evaluating To be Op Da
Summary: opportunity and Challenge--- OSSE FY-3 early-orbit satellite; FY-4 (high spectral ir, MW) The early warning system from CMA/NSMC will contribute
to the operational NWP centers; NWP users, CMA Agency and Manufacture work together
on FY3C even closely; The feedback mechanism between the agency and NWP
centres is contributing much to the improvement of data quality and assimilation;
We are expecting through the closer collaborations among the three parties, the FY-3 data assimilation in NWP models will be advanced to a new stage.
